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3200=m*640000\2
6400=m*640000
m= 0,01kg
V - 800m/s
Ek = mv²/2
mv² = 2Ek/V²
m= 2Ek/v²
m= 2* 3200J/800²
m = 6400/640000
m= 0,01
Ek=(m*v2):2
Ek=3200 J
v=800 m/s
m=?
3200=(m*800^2):2
3200=[(m*640000):2]/*2
6400=640000m
640000m=6400/:640000
m=0,01kg